Biswas, Ranita, and Jaya Sil. “An Improved Canny Edge Detection Algorithm Based on Type-2 Fuzzy Sets.”https://doi.org/10.1016/j.protcy.2012.05.134__Procedia Technology. Elsevier, 2012.https://doi.org/10.1016/j.protcy.2012.05.134 .